:root {
	/* 颜色 */
	--white: #e9e9e9;
	--gray: #333;
	--blue: #095c91;
	--blue-r: #315a7491;
	--lightblue: #0393a3;

	/* 圆角 */
	--button-radius: 0.7rem;

	/* 大小 */
	--max-width: 758px;
	--max-height: 420px;

	font-size: 16px;
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
		Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
}

body {
	align-items: center;
	background-color: var(--white);
	background-attachment: fixed;
	background-position: center;
	background-repeat: no-repeat;
	background-size: cover;
	display: grid;
	height: 100vh;
	place-items: center;
}

.form_title {
	font-weight: 300;
	margin: 0;
	margin-bottom: 1.25rem;
}

.link {
	color: var(--gray);
	font-size: 0.9rem;
	margin: 1.5rem 0;
	text-decoration: none;
}

.container {
	background-color: var(--white);
	border-radius: var(--button-radius);
	box-shadow: 0 0.9rem 1.7rem rgba(0, 0, 0, 0.25),
		0 0.7rem 0.7rem rgba(0, 0, 0, 0.22);
	height: var(--max-height);
	max-width: var(--max-width);
	overflow: hidden;
	position: relative;
	width: 100%;
}

.container_form {
	height: 100%;
	position: absolute;
	top: 0;
	transition: all 0.6s ease-in-out;
}

.container--signin {
	left: 0;
	width: 50%;
	z-index: 5;
}

.container.right-panel-active .container--signin {
	transform: translateX(100%);
}

.container--signup {
	left: 0;
	opacity: 0;
	width: 50%;
	z-index: 4;
}

.container.right-panel-active .container--signup {
	-webkit-animation: show 0.6s;
	        animation: show 0.6s;
	opacity: 1;
	transform: translateX(100%);
	z-index: 8;
}

.container_overlay {
	height: 100%;
	left: 50%;
	overflow: hidden;
	position: absolute;
	top: 0;
	transition: transform 0.6s ease-in-out;
	width: 50%;
	z-index: 100;
}

.container.right-panel-active .container_overlay {
	transform: translateX(-100%);
}

.overlay {
	background-color: rgba(255, 255, 255, 0.25);
	background-attachment: fixed;
	background-position: center;
	background-repeat: no-repeat;
	background-size: cover;
	height: 100%;
	left: -100%;
	position: relative;
	transform: translateX(0);
	transition: transform 0.6s ease-in-out;
	width: 200%;
}

.container.right-panel-active .overlay {
	transform: translateX(50%);
}

.overlay_panel {
	align-items: center;
	display: flex;
	flex-direction: column;
	height: 100%;
	justify-content: center;
	position: absolute;
	text-align: center;
	top: 0;
	transform: translateX(0);
	transition: transform 0.6s ease-in-out;
	width: 50%;
}

.overlay--left {
	transform: translateX(-20%);
}

.container.right-panel-active .overlay--left {
	transform: translateX(0);
}

.overlay--right {
	right: 0;
	transform: translateX(0);
}

.container.right-panel-active .overlay--right {
	transform: translateX(20%);
}

.btn {
	background-color: var(--blue);
	background-image: linear-gradient(90deg, var(--blue) 0%, var(--lightblue) 74%);
	border-radius: 20px;
	border: 0.2px solid var(--blue-r);
	color: var(--white);
	cursor: pointer;
	font-size: 0.8rem;
	font-weight: bold;
	letter-spacing: 0.1rem;
	padding: 0.9rem 4rem;
	text-transform: uppercase;
	transition: transform 80ms ease-in;
}

.form > .btn {
	margin-top: 1.5rem;
}

.btn:active {
	transform: scale(0.95);
}

.btn:focus {
	outline: none;
}

.form {
    background-color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    padding: 0 3rem;
    height: 100%;
    text-align: center;
}

.input {
    background-color: #fff;
    border: none;
    padding: 0.9rem 0.9rem;
    margin: 0.5rem 0;
    width: 100%;
}

@-webkit-keyframes show {
    0%,
    49.99% {
        opacity: 0;
        z-index: 4;
    }

    50%,
    100% {
        opacity: 1;
        z-index: 8;
    }
}

@keyframes show {
    0%,
    49.99% {
        opacity: 0;
        z-index: 4;
    }

    50%,
    100% {
        opacity: 1;
        z-index: 8;
    }
}


.slidershow {
    position: absolute;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
}

.slidershow--image {
    position: absolute;
    width: 100%;
    height: 100%;
    background: no-repeat 50% 50%;
    background-size: cover;
    -webkit-animation-name: kenburns;
    animation-name: kenburns;
    -webkit-animation-timing-function: linear;
    animation-timing-function: linear;
    -webkit-animation-iteration-count: infinite;
    animation-iteration-count: infinite;
    -webkit-animation-duration: 16s;
    animation-duration: 16s;
    opacity: 1;
    -webkit-transform: scale(1.2);
    transform: scale(1.2);
}

.slidershow--image:nth-child(1) {
    -webkit-animation-name: kenburns-1;
    animation-name: kenburns-1;
    z-index: 3;
}

.slidershow--image:nth-child(2) {
    -webkit-animation-name: kenburns-2;
    animation-name: kenburns-2;
    z-index: 2;
}

.slidershow--image:nth-child(3) {
    -webkit-animation-name: kenburns-3;
    animation-name: kenburns-3;
    z-index: 1;
}

.slidershow--image:nth-child(4) {
    -webkit-animation-name: kenburns-4;
    animation-name: kenburns-4;
    z-index: 0;
}

@-webkit-keyframes kenburns-1 {
    0% {
        opacity: 1;
        -webkit-transform: scale(1.2);
        transform: scale(1.2);
    }
    1.5625% {
        opacity: 1;
    }
    23.4375% {
        opacity: 1;
    }
    26.5625% {
        opacity: 0;
        -webkit-transform: scale(1);
        transform: scale(1);
    }
    100% {
        opacity: 0;
        -webkit-transform: scale(1.2);
        transform: scale(1.2);
    }
    98.4375% {
        opacity: 0;
        -webkit-transform: scale(1.21176);
        transform: scale(1.21176);
    }
    100% {
        opacity: 1;
    }
}

@keyframes kenburns-1 {
    0% {
        opacity: 1;
        -webkit-transform: scale(1.2);
        transform: scale(1.2);
    }
    1.5625% {
        opacity: 1;
    }
    23.4375% {
        opacity: 1;
    }
    26.5625% {
        opacity: 0;
        -webkit-transform: scale(1);
        transform: scale(1);
    }
    100% {
        opacity: 0;
        -webkit-transform: scale(1.2);
        transform: scale(1.2);
    }
    98.4375% {
        opacity: 0;
        -webkit-transform: scale(1.21176);
        transform: scale(1.21176);
    }
    100% {
        opacity: 1;
    }
}

@-webkit-keyframes kenburns-2 {
    23.4375% {
        opacity: 1;
        -webkit-transform: scale(1.2);
        transform: scale(1.2);
    }
    26.5625% {
        opacity: 1;
    }
    48.4375% {
        opacity: 1;
    }
    51.5625% {
        opacity: 0;
        -webkit-transform: scale(1);
        transform: scale(1);
    }
    100% {
        opacity: 0;
        -webkit-transform: scale(1.2);
        transform: scale(1.2);
    }
}

@keyframes kenburns-2 {
    23.4375% {
        opacity: 1;
        -webkit-transform: scale(1.2);
        transform: scale(1.2);
    }
    26.5625% {
        opacity: 1;
    }
    48.4375% {
        opacity: 1;
    }
    51.5625% {
        opacity: 0;
        -webkit-transform: scale(1);
        transform: scale(1);
    }
    100% {
        opacity: 0;
        -webkit-transform: scale(1.2);
        transform: scale(1.2);
    }
}

@-webkit-keyframes kenburns-3 {
    48.4375% {
        opacity: 1;
        -webkit-transform: scale(1.2);
        transform: scale(1.2);
    }
    51.5625% {
        opacity: 1;
    }
    73.4375% {
        opacity: 1;
    }
    76.5625% {
        opacity: 0;
        -webkit-transform: scale(1);
        transform: scale(1);
    }
    100% {
        opacity: 0;
        -webkit-transform: scale(1.2);
        transform: scale(1.2);
    }
}

@keyframes kenburns-3 {
    48.4375% {
        opacity: 1;
        -webkit-transform: scale(1.2);
        transform: scale(1.2);
    }
    51.5625% {
        opacity: 1;
    }
    73.4375% {
        opacity: 1;
    }
    76.5625% {
        opacity: 0;
        -webkit-transform: scale(1);
        transform: scale(1);
    }
    100% {
        opacity: 0;
        -webkit-transform: scale(1.2);
        transform: scale(1.2);
    }
}

@-webkit-keyframes kenburns-4 {
    73.4375% {
        opacity: 1;
        -webkit-transform: scale(1.2);
        transform: scale(1.2);
    }
    76.5625% {
        opacity: 1;
    }
    98.4375% {
        opacity: 1;
    }
    100% {
        opacity: 0;
        -webkit-transform: scale(1);
        transform: scale(1);
    }
}

@keyframes kenburns-4 {
    73.4375% {
        opacity: 1;
        -webkit-transform: scale(1.2);
        transform: scale(1.2);
    }
    76.5625% {
        opacity: 1;
    }
    98.4375% {
        opacity: 1;
    }
    100% {
        opacity: 0;
        -webkit-transform: scale(1);
        transform: scale(1);
    }
}